USB sockets

zax47

Hmmm, some d!ckhead keyboard warrior or some time served electricians (one with a Physics degree). Tricky one. :rotfl:

Just coz it CAN give a MAXIMUM of 4.5A doesn't mean that anything plugged in will either a) ask for that or b) need that. Your Ipad/Iphone/otherfashionstatement certainly won't/cant.... :T

Geodark

zax47 wrote: »

Hmmm, some d!ckhead keyboard warrior or some time served electricians (one with a Physics degree). Tricky one. :rotfl:

Just coz it CAN give a MAXIMUM of 4.5A doesn't mean that anything plugged in will either a) ask for that or b) need that. Your Ipad/Iphone/otherfashionstatement certainly won't/cant.... :T

Exactly, basic school level electronics here - voltage is pushed, current is drawn! school level stuff. 4.5a is the maximum current it can supply, not what current it will push to your devices. Load determines current.

Geodark

ashleypride wrote: »

USB charging is not just about power, the device and charger negotiate the charging rate, so the maximum rating of the charger can be irrelevant.

Some information here
http://apcmag.com/android-usb-charging-secrets.htm/

Sorry, but a charger can never deliver higher voltage than it is designed to, and can never safely supply more current that it is designed to - even in the link you supplied the settings it mentioned detailed how to set the phone to charge at different currents. if the rating of a charger is 1500ma (1.5A) and you set the phone to charge at 2000ma (2A) how exactly is the charger going to supply that?

DTDfanBoy

zax47 wrote: »

Hmmm, some d!ckhead keyboard warrior or some time served electricians (one with a Physics degree). Tricky one. :rotfl:

Just coz it CAN give a MAXIMUM of 4.5A doesn't mean that anything plugged in will either a) ask for that or b) need that. Your Ipad/Iphone/otherfashionstatement certainly won't/cant.... :T

" time served electricians " :rotfl: Well that sums it up rather nicely, I take it they weren't handing out degrees in English at the same time as you qualified

The facts are it delivers that amperage as that is what it was designed to deliver, unsurprisingly it was designed that way as, unless you live in a cave, you can now purchase devices that don't take several hours to charge :T

If you want to hard wire some cheap tat into your walls by all means do so, just don't complain in a couple of years time when your grandchildren prefer to use the socket beside them :eek:

brightontraveller

From experience Having changed 100s for one client LAP = Lousy and problematic the BG (nexus tat ) are just as bad, along with the Denman’s personal experience go with MK or at a push Deta or not bother at all they both also had there problems but nothing like the vast majority on the market…

zax47

Oi, DTDfanboy, are you a total f'ckwit or just a partial one - just which bit aren't you getting?

Yes, it may be able to deliver 4.5A IF ASKED. However, no USB spec currently rates ANY of the charging systems beyond 2/2.1A so NO CURRENT DEVICE you plug in will EVER draw the whole 4.5A as no device you plug in will EVER ask for it! Maybe, in the future, a USB4 or USB5 spec MIGHT increase the maximum current requirement but right now it DOESN'T!

NOT ROCKET SCIENCE!! :eek:

squeeks

Quick look at wiki on the USB standards for USB 3.0:
"The Battery Charging Specification requires that the physical ports themselves be capable of handling 5 A of current[citation needed] but limits the maximum current drawn to 1.5 A."

A lot of the specs are based on what to expect when plugged in to a PC, charging is a whole different matter, many chargers exceed the current for the ports. 0.5 A to 0.9A being the USB normal (USB 1.0/2.0), but may wall warts will be 2.1A plus and the reason why devices typically charge quicker using the wall socket than connected to a PC. Apple devices for example have some resistors on the data lines to help the device and wall charger negotiate the amount of current it can draw above the normal specs (and identify it as an Apple charger). Adafruit have a nice reverse engineering article on it if you are interested : https://blog.adafruit.com/2010/08/03/the-mysteries-of-apple-device-charging-video/

Mankysteve

Usb whole different kettle of fish. As it's complete new connector and runs on 12 no 5.

While there might be some non compliant us devices out there. All main stream phones and the sort will be limited to the 2 amp charging current as that's what the standard is.

Zola.

In short, are they worth getting or are they a bit !!!!?

Will they charge a device as quickly as the device's power pack charger would?

Also, do they need special wiring to fit, or can one be taken off and the new on installed?

50Twuncle

zola. wrote: »

in short, are they worth getting or are they a bit !!!!?

will they charge a device as quickly as the device's power pack charger would?

also, do they need special wiring to fit, or can one be taken off and the new on installed?

Yes
The same - if not faster
They are a simple replacement job